Efficient polymer-nanocrystal quantum-dot photodetectors

Qi, Difei; Fischbein, Michael D.; Drndić, Marija; Selmic, Sandra

doi:10.1063/1.1872216

Cited by 158 publications

(104 citation statements)

References 11 publications

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“…One approach is to use all of the available energy of high-energy photons by generating multiple excitons from a single absorbed photon. Ellingson et al (85) reported multiple exciton generation by using PbSe and PbS quantum dots; Qi et al (86) have also reported similar results with polymer-quantum dot blends (86). The ability to capture and use all of the energy from a highenergy photon greatly improves the overall energy efficiency of solar energy conversion.…”

Section: Opportunities For Nanotechnology: Synthetic and Biomimetic Asupporting

confidence: 51%

Approaches for biological and biomimetic energy conversion

LaVan

Jennifer²

2006

Proc. Natl. Acad. Sci. U.S.A.

116

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This article highlights areas of research at the interface of nanotechnology, the physical sciences, and biology that are related to energy conversion: specifically, those related to photovoltaic applications. Although much ongoing work is seeking to understand basic processes of photosynthesis and chemical conversion, such as light harvesting, electron transfer, and ion transport, application of this knowledge to the development of fully synthetic and͞or hybrid devices is still in its infancy. To develop systems that produce energy in an efficient manner, it is important both to understand the biological mechanisms of energy flow for optimization of primary structure and to appreciate the roles of architecture and assembly. Whether devices are completely synthetic and mimic biological processes or devices use natural biomolecules, much of the research for future power systems will happen at the intersection of disciplines.biotechnology ͉ nanotechnology ͉ photosynthesis ͉ photovoltaic R ecently, the National Academies and the Keck Foundation held a meeting to discuss the development of new applications for nanotechnology ¶ with the goal of identifying challenges where the convergence of nanoscience and physical and biosciences could provide a revolutionary outcome. One area clearly in need of new technologies is biological and biomimetic methods of energy conversion. Within this broad area, focus was given to two specific applications: the conversion of solar energy into useful electrical or chemical energy and the production of power for in vivo medical devices. The following sections will provide both an economic perspective on current photovoltaic (PV) technology and an overview of the various research efforts toward using or mimicking biological systems to improve current and future energy-conversion systems.

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Section: Opportunities For Nanotechnology: Synthetic and Biomimetic Asupporting

confidence: 51%

Approaches for biological and biomimetic energy conversion

LaVan

Jennifer²

2006

Proc. Natl. Acad. Sci. U.S.A.

116

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“…Using the size effect, the optical absorption and emission spectra of the nanocrystals can further be conveniently tuned. These make nanocrystals attractive for use in different optoelectronic device applications including LEDs [11,12], hybrid white light sources [13], photovoltaic cells [14], photodetectors [15] and optical memories [16]. However, the applications of nanocrystals are not limited only to such devices.…”

Section: Introductionmentioning

confidence: 99%

Nanocrystal hybridized scintillators for enhanced detection and imaging on Si platforms in UV

Mutlugün¹,

Soğancı²,

Demir³

2007

Opt. Express

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Abstract:We report on the conception, design, fabrication, experimental characterization, and theoretical analysis of nanocrystal scintillators hybridized on Si detectors and CCDs for enhanced detection and imaging in UV. Integrating luminescent CdSe/ZnS core-shell nanocrystals (NCs of 3.2 and 5.2 nm in diameter with 5% size distribution) to efficiently convert incident UV radiation to visible emission, we demonstrate hybrid NC-Si photodetectors that exhibit significantly improved responsivity between 200-240nm, experimentally with a two orders of magnitude peak enhancement and theoretically with a three orders of magnitude peak enhancement. Such nanocrystal based scintillators hold great promise in UV detection and imaging on Si platforms.

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“…Most of the QDs used in UV-PDs are binary systems, the band gap of which are tuned by varying the diameter of the nanoparticle [1][2][3][4][5]7,8,16]. However in ternary QDs, the band gap may be tuned by the relative composition of materials used as well [6,17].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, due to the possibility to change the photo physical properties through simplified chemical synthesis and easy thin film processing, quantum dots (QD) and polymer:QD hybrids attract a lot of attention in UV-PD applications [1][2][3][4][5][6][7][8], as well as the other photonic applications, such as biological imaging and contrast agents [9,10], light-emitting devices (LEDs) [11,12] photovoltaic [13][14][15], etc. Most of the QDs used in UV-PDs are binary systems, the band gap of which are tuned by varying the diameter of the nanoparticle [1][2][3][4][5]7,8,16].…”

Section: Introductionmentioning

confidence: 99%

An ultraviolet photodetector with an active layer composed of solution processed polyfluorene:Zn0.71Cd0.29S hybrid nanomaterials

Sevim

Memişoğlu

Varlıklı

et al. 2014

Applied Surface Science

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a b s t r a c tAn ultraviolet photodetector with an active layer of solution processed polymer:quantum dot hybrid is introduced. Poly[9,9-di-(2-ethylhexyl)-fluorenyl-2,7-diyl] represents the polymer and Zn 0.71 Cd 0.29 S is the quantum dot used for the device. Photophysical studies showed that an electron transfer from the polymer to the ternary quantum dot is thermodynamically favored. Quenching experiments performed between the polymer and quantum dot indicates the formation of a non-fluorescent complex with an association constant of 4.6 × 10 4 M −1 . The device structure of ITO/PEDOT:PSS/ADS231BE: 50 wt% Zn 0.71 Cd 0.29 S/Al yielded a photoresponsivity value of 324 mA/W at −4 V under 1 mW/cm 2 illumination at 365 nm at room temperature and this value is further increased to 380 mA/W as a result of annealing at 75 • C.

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Efficient polymer-nanocrystal quantum-dot photodetectors

Cited by 158 publications

References 11 publications

Approaches for biological and biomimetic energy conversion

Approaches for biological and biomimetic energy conversion

Nanocrystal hybridized scintillators for enhanced detection and imaging on Si platforms in UV

An ultraviolet photodetector with an active layer composed of solution processed polyfluorene:Zn0.71Cd0.29S hybrid nanomaterials

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